Weather StoryAlmanac, microseasons, and the day's weather story.

Roslyn Harbor, New York Weather

Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →

Roslyn Harbor weather forecast — hour by hour, 7-day outlook, NOAA radar

Roslyn Harbor, NY
Saturday, July 4 at 4:06 PM
97
°
Clear
Feels like
99°
Humidity
33%
Wind
10 mph
Sunrise
1:28 AM
Sunset
4:29 PM
Roslyn Harbor, NY
Hour by hour · 24h
24-Hour ForecastRoslyn Harbor, NY: 24-hour forecast. Temperatures range from 73 to 98 degrees Fahrenheit with a 42% chance of precipitation at 12 AM.
L 73°H 98°
Roslyn Harbor, NY
7-day forecast
  1. Today
    Jul 4
    Overcast
    33%
    —
    98°76°—
  2. Sunday
    Jul 5
    Heavy Rain
    51%
    2.7″
    89°71°-9°
  3. Monday
    Jul 6
    Rain
    89%
    0.18″
    72°70°-17°
  4. Tuesday
    Jul 7
    Light Drizzle
    81%
    0.04″
    70°64°-2°
  5. Wednesday
    Jul 8
    Overcast
    21%
    —
    81°63°+11°
  6. Thursday
    Jul 9
    Overcast
    12%
    —
    91°71°+10°
  7. Friday
    Jul 10
    Overcast
    50%
    —
    92°75°+1°
Roslyn Harbor, NY
Next 24 hours · Hot now
HOT 90°65°85°105°12p6p12a6anow 97°high 98°low 73°PRECIP %
Roslyn Harbor, NY
Anemometer · 24h winds · from true
NESW
From · True
WNW
297° · veering 28°
Direction
WNW
297°
Sustained
10
mph
Gust
17
mph
Peak 24h
23
avg 8
Beaufort · 3 · GENTLE BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 8 · pk 23 @ 6:00p
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 269SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 28° from the wnw.
Roslyn Harbor, NY
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1007.0
-0.4 mb in 3h · steady · 29.74 inHg
Now
1007.0
mb
3h
-0.4
mb
12h
-0.5
mb
24h
0.0
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1007–1008
1000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR-21h-18h-15h-12h-9h-6h-3h-24hNOW1008.31006.61007.0
−24h−18h−12h−6hnow
Damp, unsettled regime — wet weather lingers nearby.
Roslyn Harbor, NY
Air quality
109
AQI
Unhealthy for Sensitive Groups
↑+50 in 6h▲Peak ~152 @ 11 PM

AQI 109 (Unhealthy for Sensitive Groups), driven by Ozone. AQI up 50 in the last 6 hours — air quality is degrading. Ozone at AQI 166 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.

PM 2.5Moderate
16.5μg/m³
PM 10Good
19μg/m³
NO₂Good
5μg/m³
OzoneDRIVERUnhealthy
180μg/m³
UV IndexModerate
4.3

What's driving it

Ozone × UV × Sky

Ozone at AQI 166 — peak already passed at 1 PM under clear skies. Levels should ease through evening.

Present
AQI 166
UV peak
3.9 at earlier today
Sky at peak
clear
Projected peak
AQI 166

PM × Wind × Precip

PM2.5 at 16.5 µg/m³, PM10 at 19.0 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.87
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

Trends

Seven days of AQI and PM2.5.

Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³740
Roslyn Harbor, NY
Sky cover · visibility · 24h
Cloud cover
11%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
108.0mi
UNLIMITED
109 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
20:06 UTC · Roslyn Harbor, NY · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
20:06 UTC · Roslyn Harbor, NY · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Roslyn Harbor, NY
Satellite · infrared · animated
Roslyn Harbor, NY
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Roslyn Harbor, NY
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
4:56 AM
Sunrise
1:28 AM
Daylight
15h 01m
Sunset
4:29 PM
Civil dusk
9:03 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Roslyn Harbor, NY
The moon
Waning Gibbous
79% illuminated
Moonrise
10:49 PM
Moonset
9:57 AM
In sign
♓︎ Pisces
Roslyn Harbor, NY
Microseason
Jul 1–5

Cicadas claim the afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Roslyn Harbor at a glance

  • Today vs. normal: 26°F above the seasonal normal for this latitude
  • Last frost: April 21 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

16-Day Forecast — Roslyn Harbor

  1. Sat98°76°33%
  2. Sun89°71°51%
  3. Mon72°70°89%
  4. Tue70°64°81%
  5. Wed81°63°21%
  6. Thu91°71°12%
  7. Fri92°75°50%
  8. Sat89°78°42%
  9. Sun86°73°24%
  10. Mon75°68°22%
  11. Tue83°68°24%
  12. Wed88°69°31%
  13. Thu92°74°43%
  14. Fri95°75°45%
  15. Sat93°77°35%
  16. Sun93°78°48%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.

SPC Convective Outlook

Storm Prediction Center — Roslyn Harbor

SPC has placed Roslyn Harbor in the Slight Risk category for severe thunderstorms today.

  • TODAYSLGTSlight Risk
  • TOMORROWMRGLMarginal Risk
  • DAY 3TSTMGeneral Thunderstorms

Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.

Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 1–5

Cicadas claim the afternoon

Annual cicada buzz begins, peaking in the heat of the day.

Day 185 of 365 · Wedge 37 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

In Roslyn Harbor, July runs warmest near 76°F and January coldest around 31°F, while December is the wettest month (4.3 inches) and February the driest (3.0 inches).

MonthMean tempPrecipRainy days
January31°3.6″13
February33°3.0″13
March40°3.8″15
April50°4.0″17
May59°3.8″18
June69°3.6″16
July76°3.3″16
August75°4.0″17
September69°3.4″13
October58°3.3″11
November45°4.0″13
December36°4.3″13

Frequently asked

When does it freeze in Roslyn Harbor?
In Roslyn Harbor, expect the last spring frost near mid-April; Roslyn Harbor's first autumn frost comes around mid-November.
What is the rainy season in Roslyn Harbor?
Rainfall in Roslyn Harbor peaks in December near 4.3 inches, out of about 44 inches annually.
What is the warmest month in Roslyn Harbor?
The warmest stretch in Roslyn Harbor comes in July, around 76°F on average.
What is the coldest month in Roslyn Harbor?
On average January is the chilliest month in Roslyn Harbor, about 31°F.
When can I start a vegetable garden in Roslyn Harbor?
Time tomatoes in Roslyn Harbor for two weeks after mid-April; peas and greens start at Roslyn Harbor's frost line.
How many rainy days does Roslyn Harbor get?
Expect roughly 175 wet days a year in Roslyn Harbor.
What hardiness zone is Roslyn Harbor?
Roslyn Harbor's hardiness zone tracks its winter low; with January near 31°F, check the USDA ZIP map for the exact zone.
What is the 10-day forecast for Roslyn Harbor?
Roslyn Harbor's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Roslyn Harbor?
See this week's day-by-day rain chances for Roslyn Harbor in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Roslyn Harbor?
Current conditions for Roslyn Harbor and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Roslyn Harbor forecast updated?
The Roslyn Harbor forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Roslyn Harbor?
Today's sunrise and sunset times for Roslyn Harbor are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Roslyn Harbor?
The next few days in Roslyn Harbor's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Roslyn Harbor's warm-summer humid continental climate in New York pairs 31°F Januarys with 76°F Julys, 45°F apart across the seasons.

In a typical year Roslyn Harbor records about 44 inches of precipitation on around 175 days.

The 45°F gap between Roslyn Harbor's summer and winter, at 40.8°N, shapes Roslyn Harbor's frost calendar.

Beaches near Roslyn Harbor

Each linked page shows live water temperature, wave height, swim and surf verdicts, tides, and rip-current risk from NDBC + NOAA + NWS data.

All cities in New York →

Levittown, NY weather →

ZIP codes in Roslyn Harbor

  • 11576

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.